Process of preventing formation of frost on refrigerating-surfaces.



No. 644,847. Patented Mar. 6, I900.

' M. COOPER. PROCESS OF PREVENTING FORMATION OF FROST ON REFBlGERATING SURFACES.

(Application mek Sept. 25, 1899.)

(No Nodal.)

W NE INVENTUB' NADIEON COOPER V UNITE ESTATES I P TENT 'QFFICE.

MADISON COOPER, OF MINNEAPOLIS. MINNESOTA.

PROCESS or rnr'yzmme FORMATION or Frost N REFBlGERATING-SURFACES SPECIFICATION forming part of Letters Patent No. 644,847, dated March 6, 1900.

APPHWtiOH filed September 25,1899. Serial No. 781,557. (No specimens.) V

To all whom it may concern:

Be it known that LMADISON O00PER,of Minneapolis, Hennepin county, Minnesota, have invented certain new and useful Improvements in Processes of Preventing the Formation of Frost Upon Refrigerating-Surfaces, of which the following is a specification.

This invention relates to a new and useful process of preventing the formation of frost upon refrigerating-surfaces and at the same time dehydrating and purifying the air which is brought in contact with such refrigerating surfaces.

The invention consists generally in the process of preventing the'formation of frost upon refrigerating-surfaces by placing chlorid of calcium or other deliquescent salt inproximity to such refrigerating-surfaces,

whereby the moisture from the atmosphere section of a cold-storage apparatus in connection with which my process may be employed. Fig. 2 is a plan view, and Fig. '3 a transverse section, of a trough or gutter that may be used in carrying out my. process. Fig. 4 is a perspective view showing a series of troughs or gutters arranged in connection with refrigerating-pipes for carrying out my process.

In'carrying out my improved process I employ chlorid of calcium or other deliquescent of the drawings a cold-storage apparatus salt which is placed in proximity 'to pipes or other refrigerating-surfaces. The" moisture rom the air uniting with the salt forms a brine which flows over the refrigerating-surfaces and prevents the formation of frost thereon. This action also dehydrates and pur rides the air.

As illustrating-suitable apparatus for carrying out my process, I have shown "in Fig. 1

provided. with an air-cooling room 2. Ar

ranged in this room are suitable refrigerating pipes or surfaces 3. The air is drawn from this room by means of a fan or blower 5 through a suitable conductor 7. From the fan- 'casing the air passes through suitable conductors 9 to the storage-rooms from which it is distributed by suitable means throughout the lower portions of the rooms. The air passes through the storage-rooms and through perforated false ceilings or other suitable devices to the return ducts or conveyors 11, through which it is carried back to the air-cooling room 2. Arranged in the airoooling room, preferably directly over the refrigerating pipes or surfaces 3, are a series of troughs or gutters 13, provided, preferably, with slotted or perforated bottoms. These troughs or gut ters have chlorid of calcium or other deli-' queseent salt placed therein, as indicated in Fig. 4 of the drawings. The moisture of the air unites with this salt, forminga brine which escapes through the perforated bottom of the trough or gutter and flows over the refrigerating pipes or surfaces, and thereby prevents the formation of frost upon said pipes or surfaces. This action also dehydrates and purifies the air, rendering it suitable to be again forced through the cold-storage rooms. The

brine after flowing over the ref rigerating-surfaces and collecting the impurities from the air may be led into a suitable conductor and discharged into the waste-pipe or sewer.

I do not limit myself to the details of the process nor to its use in connection'with any particular apparatus. The apparatus herein illustrated is considered to be suitable for the purpose; but obviously any other suitable devices may be used in place of those herein shown and described.

I do not in this application claim the apparatus herein shown, as I have claimed the samein a separate application, Serial No. 722,633, filed July 3, 1899.

Having thus described -my invention, I claim as new and desire to secure by Letters Iatenti 1. The process of preventing the formation of frost upon refrigerating'surfaces, which consists in placing chlorid of calcium,or other deliquescont saltin a solid form, in proximity to said surfaces permitting the moisture of the atmosphere to unite with said deliquvscont salt to form a brine and allowing saidbrino to flow over said refrigerating-s11rfaces.

2. The process of keeping ref rigerat-ing-surfaces free from host and purifying and drying the air which is tobe cooled by said surfaces, which consists of placing chlorid of calcium, or other doliquosc'ent ,salt in a solid form in proximityto said surfaces and passingair ovorsaid surfaces while they are coated with brine fOrmod by the unitingof the moisture of the atmosphere with said salt.

3. The process of dehydrating and purifying air, which consists in placing chlorid of calcium or other deli ucscent salt in a solid I5 7 MADISON COOPER.

In presence of- A. 0. PAUL, A. F. HOLMES. 

